I have 2 1918 kits I picked up recently. Just about done with one and was looking at the 1978 Titan kit. It looks to me like these are basically the same kit, except for nosecone and decals and I could easily make my extra 1918 Titan II into a 1978 with a 3d print nose cone and home decals. Sound right?

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Build floor: Estes Pro Series Jayhawk, Estes LTV Scout, MRC Trail Blazer.

In paint: MRC Trail Blazer. Semroc Ruskie - Repair

Ready for 1st flight:
Semroc Launch, Estes Marauder, SWQ Gartrell, MRC Iron Man, Estes Doorknob, SQW DSRV Gartrell, Estes SASHA, Estes Delta Star, BT60 3D Print Bomarc, thanks Texas Winds and rain.
Austin TX

Yes, correct.
Check body tube length though. The Titan II may have a longer tube length than the Gemini Titan.

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